Method of making fertilizing material.



UNITED STATiliPATENT orr on,

W'ILL-IAM'BACI-IMAN CHISOLM, F CHARLESTON, SOUTH CAROLINA.

M THOD-0F MAKme' FERTILIZING MATERIAL.

Specification of Letters Patent.

' Patented June 26.. 1906.

' Application filed September-19,1904. ser 'ai No. 225,103.

To all whom it may concern! Be it lmown that '1, WILLIAM BAGHMAN CmsoLiu, a citizen of the United States, re-

in Charleston, county of Charleston,

State of South Carolina, have invented certain new and useful Improvements in Methods of Making Fertilizing Material; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in-the art to which it .appertains to make and use the .same.

appllication filed by me of even date herewith ave described the production of a fertil zing agent having as a constituent part thereof a homogeneous mixture of phos vphate rockor hosphate material and sulfur in" the form 0 an impalpable powder. The

, extra fineness of the particles of phosphatic invention, however, so far as I am aware, it

hasi'beenjrn ossible to grind this lessergrade of lump sulflir to anythingnear the desired grade of fineness'de'sirable for the practice of my invention, for the reason that the sulfur when placed in the grinding-mill has a tendency to maintain the cohesion of its particles as against the reducing action of the mill, so that the resulting product of an attempt to grind the sulfur is a mixture of coarse flakes and large particles unsuited to the uses contemplated by me.

My present invention residesin the discove that solid or lump sulfur can be reduce to the form of an lmpalpable owder, as specified, by, first crushing it roug y and grinding it in a mill together with crushed phosphatic rock, with the resultant effect part.

that thesulfur particles are not only reduced to the degree of fineness desired, but that they are intimately and homogeneously intermixed-with similarly-reduced particles of phosphatic rock. The hard sharp angles of the phosphatic rock during the reducing operatlon' apparently subserve the function of minutelysubdividing the) sulfur and by inter osing themselvesbetween the sulfur partic es preventing the. flaking which would result were it attempted to grind the sulfur alone. j

In the practice of my invention for the production of the fertilizing and germicidal glent desired I first roughly crush a batch of p osphatic rock or phospli'atic material and sulfur in the proportions of, say, forty to one hundred .pounds of sulfur to two thousand pounds of the mixture of which it forms a to the action of a Lucop mill or. other grinding-mill of an analogous type in regulated quantity and grind. the mixture to an impalpable powder, the tailings being retained by The crushed mixture I then subject the screens and returned to the mill for regrinding. 1

Having thus described my invention, what Iclaim is' 1. The -method of preparing a substantially impalpable powder for use in fertilizers,

which consists in mixing and grinding sulfur together with phosphate rock, or phosphatic material; substantially as described.

2. The rocess'of grinding sulfur to a sub stantially lmpalpable powder and simultane-' ously effecting its intimate homogeneous admixture with phosphate rock, or phosphatic material, which consists infirst roughly crushing the sulfur and phosphate rock, or phosphatic material, before grinding, and then subjecting them together to the grinding operation; substantialy as described.

In testimony whereof I aflix' my signature in presence of two witnesses.

WILLIAM BAOHMAN 'cmscm. Witnesses:

. JOHN D..MULLER," 'L. W. WHITIITG. 

